// if (document.images) {
//  main1 = new Image(); main1.src = "../map/main-bk.jpg";
//  main2 = new Image(); main2.src = "../map/main-em.jpg";
//  songs1 = new Image(); songs1.src = "../map/songs-bk.jpg";
//  songs2 = new Image(); songs2.src = "../map/songs-em.jpg";
// }

  ftmain1 = new Image(); ftmain1.src = "map/ftmain-bk.jpg";
  ftmain2 = new Image(); ftmain2.src = "map/ftmain-em.jpg";
  fttoyin1 = new Image(); fttoyin1.src = "map/fttoyin-bk.jpg";
  fttoyin2 = new Image(); fttoyin2.src = "map/fttoyin-em.jpg";
  ftfoonli1 = new Image(); ftfoonli1.src = "map/ftfoonli-bk.jpg";
  ftfoonli2 = new Image(); ftfoonli2.src = "map/ftfoonli-em.jpg";


function imgOn(imgName, imgno) {
  if (document.images) {
       document[imgName].src = eval(imgName + imgno + ".src");
     }
}